<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>

		<h1>hello world</h1>
		
		
		<span color="red">hello</span>

		<script type="text/javascript">
			var a = 10;

			function foo() {
				
				if (false) {
					var a = 100;
				}
				// }else{
				// 	var a = 110;
				// }

				console.log('a:', a);  
			}


			foo();
		</script>
	</body>
</html>
